import tkinter as tk

# 定义按钮点击事件处理函数
def button_click(number):
    # 获取当前输入框中的内容
    current = entry.get()
    # 清空输入框
    entry.delete(0, tk.END)
    # 在输入框中插入新的数字
    entry.insert(tk.END, current + str(number))

# 定义清除按钮点击事件处理函数
def button_clear():
    # 清空输入框
    entry.delete(0, tk.END)

# 定义加法按钮点击事件处理函数
def button_add():
    # 获取当前输入框中的内容
    first_number = entry.get()
    # 将第一个数字存储在全局变量中
    global f_num
    # 将运算符存储在全局变量中
    global math
    math = "addition"
    f_num = int(first_number)
    # 清空输入框
    entry.delete(0, tk.END)

# 定义等号按钮点击事件处理函数
def button_equal():
    # 获取当前输入框中的内容
    second_number = entry.get()
    # 清空输入框
    entry.delete(0, tk.END)
    # 根据运算符进行相应的计算，并将结果插入输入框
    if math == "addition":
        entry.insert(tk.END, f_num + int(second_number))
    elif math == "subtraction":
        entry.insert(tk.END, f_num - int(second_number))
    elif math == "multiplication":
        entry.insert(tk.END, f_num * int(second_number))
    elif math == "division":
        entry.insert(tk.END, f_num / int(second_number))

# 定义减法按钮点击事件处理函数
def button_subtract():
    # 获取当前输入框中的内容
    first_number = entry.get()
    # 将第一个数字存储在全局变量中
    global f_num
    # 将运算符存储在全局变量中
    global math
    math = "subtraction"
    f_num = int(first_number)
    # 清空输入框
    entry.delete(0, tk.END)

# 定义乘法按钮点击事件处理函数
def button_multiply():
    # 获取当前输入框中的内容
    first_number = entry.get()
    # 将第一个数字存储在全局变量中
    global f_num
    # 将运算符存储在全局变量中
    global math
    math = "multiplication"
    f_num = int(first_number)
    # 清空输入框
    entry.delete(0, tk.END)

# 定义除法按钮点击事件处理函数
def button_divide():
    # 获取当前输入框中的内容
    first_number = entry.get()
    # 将第一个数字存储在全局变量中
    global f_num
    # 将运算符存储在全局变量中
    global math
    math = "division"
    f_num = int(first_number)
    # 清空输入框
    entry.delete(0, tk.END)

# 创建主窗口
root = tk.Tk()
root.title("Calculator")

# 创建输入框
entry = tk.Entry(root, width=35, borderwidth=5)
entry.grid(row=0, column=0, columnspan=3, padx=10, pady=10)

# 创建数字按钮
button_1 = tk.Button(root, text="1", padx=40, pady=20, command=lambda: button_click(1))
button_2 = tk.Button(root, text="2", padx=40, pady=20, command=lambda: button_click(2))
button_3 = tk.Button(root, text="3", padx=40, pady=20, command=lambda: button_click(3))
button_4 = tk.Button(root, text="4", padx=40, pady=20, command=lambda: button_click(4))
button_5 = tk.Button(root, text="5", padx=40, pady=20, command=lambda: button_click(5))
button_6 = tk.Button(root, text="6", padx=40, pady=20, command=lambda: button_click(6))
button_7 = tk.Button(root, text="7", padx=40, pady=20, command=lambda: button_click(7))
button_8 = tk.Button(root, text="8", padx=40, pady=20, command=lambda: button_click(8))
button_9 = tk.Button(root, text="9", padx=40, pady=20, command=lambda: button_click(9))
button_0 = tk.Button(root, text="0", padx=40, pady=20, command=lambda: button_click(0))

# 创建运算符按钮
button_add = tk.Button(root, text="+", padx=39, pady=20, command=button_add)
button_subtract = tk.Button(root, text="-", padx=41, pady=20, command=button_subtract)
button_multiply = tk.Button(root, text="*", padx=40, pady=20, command=button_multiply)
button_divide = tk.Button(root, text="/", padx=41, pady=20, command=button_divide)

# 创建等号和清除按钮
button_equal = tk.Button(root, text="=", padx=91, pady=20, command=button_equal)
button_clear = tk.Button(root, text="Clear", padx=79, pady=20, command=button_clear)

# 将按钮放置在窗口中
button_1.grid(row=3, column=0)
button_2.grid(row=3, column=1)
button_3.grid(row=3, column=2)

button_4.grid(row=2, column=0)
button_5.grid(row=2, column=1)
button_6.grid(row=2, column=2)

button_7.grid(row=1, column=0)
button_8.grid(row=1, column=1)
button_9.grid(row=1, column=2)

button_0.grid(row=4, column=0)
button_add.grid(row=5, column=0)
button_equal.grid(row=5, column=1, columnspan=2)
button_clear.grid(row=4, column=1, columnspan=2)

button_subtract.grid(row=6, column=0)
button_multiply.grid(row=6, column=1)
button_divide.grid(row=6, column=2)

# 运行主循环
root.mainloop()
